Refillable fuse



July 29, 1924. 1,502,883

M. J. SANDIN REFILLABLE FUSE Original Filed Jan. 12. 1920 WiTNESSES: INVENTOR BY 7% [M361 Patented July 29, 1924.

UNITED STATES PATENT OFFICE.

MAUBITS .1. SAN DIN, F WILKINSBURG. PUNNSYLVANIA, ASSIGNOR T0 WESTING- HOUSE ELECTRIC AND MANUFACTURING COMPANY, A CORPORATION OF PENNSYL- VANIA.

- REFILLABLE FUSE.

Application filed January 12, 1920, Serial No. 35!,947. Renewed February 2, 1924-.

t T 0 all whom it may concern: Be it known that I, MAURITS J. SANDIN, a' citizen of the United States, and a resident of Wilkinsburg, in the county of .\lle-' ghe'ny and State of Pennsylvania, have in- H vented a new and useful Improvement in Refillable Fuses, of which the following is a specification.

My invention relates to fuses and particularly to refillablecartridge fuses.

One object of my invention is to provide means for so cooling and retarding the escape of the gases generated by the volatilization of the fusible element in a cartridge fuse as to effectively extinguish the arc and I to prevent damage to surrounding objects.

"Another object of my invention is to provide an end ferrule for a cartridge fuse that shall be so interiorly threaded for a relatively short portion of its length as to permit, it to be quickly attached and ded f o the cartridge.

' Another object of my invention is toprovide a renewable cartridge fuse that shall be simple and durable in construction, economical to manufacture and effective in operation.

for directing t e escaping arc gases from its outer periphery towards a centrally-disposed opening in the end ferrule of the cartridge. The gases are so cooled, during their passage through the grooves, as to prevent the escape of flames which would be likely to cause damage.

In practicing my invention, I provide means whereby the washer, instead of hearing in flat abutment against the end of the ferrule, is engaged therewith substantial-1y only at its edges. A countersunk portion, either in the ferrule. or the washer. or in both. plot ides a cooling chamber having a relatively great cooling area. The end ferrule is so threaded for a relatively short intermediate. portion only of its interior surface as to permit it to be quickly mounted and dismounted and eliminates unnecessary threads to which the volatilized fuse element metal may adhere.

Figure 1 of the accompanying drawing is a view, partially in elevation and par tially in section, of a renewable cartridge washers 6.

The sleeve 3, having a relatively thinwalled port on 7 disposed inside the casing 1 to which it may be secured. by any-suitable means, as by rivets 8, has a relatively short exteriorly-threaded outer end portion 9 that abuts the 'end of the casing and is of substantially the same outer diameter as the casing. The ferrule 2 has a portion 10 of smooth inner bore in order that it may overlap the. end of the casing and a relativelyshort im'eriorly-threaded intermediate portion 11 for co-operation with the portion 5), of the sleeve 3. The ferrulefi is provided, adjacent to its outer or closed end. with annular interior poitions 12-, 13 and 14 of differentdiameters, the portion 12 of which isoccupied by the washer 5 and the portion 14 of which is unoccupied.

The portion 13 is of substantially the same length and diameter as the washer 6 that is supported therein to co-operate with the portion 14 to form a relatively-short cylindrical gas-cooling chamber 15. An aperture 16 in the ferrule 2 communicates with the chamber 15.

The washer 6 is preferably formed, as shown more clearly in Figs. 3 and 4. to have a plurality of inter-communicating radial grooves 17 on one face thereof which severally communicate with space-d notches 18 in the outer perimeter of the washer.

In operation. the gases generated by'the volatilization of the element 4 pass throughor around the washer 5, that may be of a usual slotted type. outwardly to the notches 19. through the notches. into the chamber 1:) and through the aperture 16 to the outer air. The relatively broad surface areas of the ferrule 2 and the washer 6. in combina tion with the grooves 17. co-operate to give the chamber 15 substantially maximum cooling surface for a given amount of occupied space; that is, the pants are constituted to to determine the flow of gases through the notches 18 which may be obstructed or ex posed by the portion 14 to greater or less extent, depending on the degree of ventilation desired.

While I have shown and described a particular formof my invention, changes may be effected therein without departing from the spirit and scope thereof, as set forth in the appended claims.

I claim as my invention:

1. A cartridge fuse comprising a discoidal member having a radial groove in one of its faces and an opening from face to face thereof communicating with the groove and disposed adjacent the periphery of the member.

2. A cartridge fuse comprising a ferrule member provided with a gas-escape passage and a removable discoidal member disposed therein having a peripheral notch constitut.- ing a gas-escape passage, one of the members being provided with a groove for establishing communication between the said gasescape passages.

3. A cartridge fuse comprising a washer having a radial groove in one of its faces and a notch in the periphery thereof at the end of thegroove;

l. A cartridge fuse comprising a ferrule having its inner end surface countersunk and a member disposed adjacent to said surface to provide a gas chamber between the ferrule and the said member.'.

5. A cartridge fuse comprising a' ferrule 7 having a countersunk inner end surface. and

a discoldal member disposed to form there with a gas chamber and having an opening communicating with the chamber.

6. A cartridge fuse, comprising a ferrule having an inwardly-extending peripheral portion, and a washer having a'peripheral notch, said portion co-operating with the washer to determine the flow of arc gases through the notch. i

7. A refillable cartridge fuse comprising an end ferrule having a countersunk end portion and having a portion only of its length interiorly threaded between the countersunk end portion and the end of the ferrule.

8. A cartridge fuse comprising a washer having a plurality of notches'in the periphery thereof and a plurality of grooves on one face thereof extending radially from the center to the respective notches, and a ferrule having means for so seating the washer as to cause the notches and grooves therein to constitute cooling passages forthe arc gases.

'9. A cartridge fuse comprising a Washer having a plurality of notches in the periphery thereof and a plurality of grooves on the inner face thereof extending radially from the center to the respective notches, v

and a second washer, the fusible member of the fuse being clamped between the inner face of the grooved washer and one face of the second washer.-

10. A cartridge fuse comprising a casin a closure disc therefor secured to the casing and having a gas escape passage therein, a

fuse member, a support for the fuse member,

a disc disposed between the said closure disc and the fuse member for clamping the fuse member to the support and having a passage establishing communication from V a point between the said discs and the interior of the casing, and means on one of the discs for separating portions of the surfaces of the discs to provide a gas-cooling passage bet ween. the discs.

In testimony whereof, I have hereunto subscribed my name this 30th day of December 1919.

MAURiTs J. SANDIN. 

